a term used to describe a rodent, ideally of the Rattus genus (which includes the likes of the common brown rat), but can vary to others including Cricetinae (hamsters), Cavia (
guinea pigs), Sciuridae (squirrels), etc., used by a group of individuals for sexual purposes such as
masturbation, oral sex, and other forms of arousal. Often this rat is passed around
immediately after being used by someone, to their friend for 'their turn'.